>>What is the best way to control the speed of a single phase 
>>induction
>>motor.

> Controlling the speed can be done using frequency control.

True

> A while back I came across the novel approach shown below. The 
> current
> passing through the motor is converted to DC. Now it becomes a 
> simple DC
> control.

This will not work for an INDUCTION motor, which is what he asked 
about. But it will work for any types of motors which relay on voltage 
or power rather than frequency for speed control.



        RM 

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